The 9800gx2 offers ~30% gain over the 8800 ultra. But from what I understand about the older 7950gx2 cards, sli needed to be enabled. Now I have read that people have problems getting the older 7950gx2 cards to work on the P35 boards because they are crossfire motherboards and not sli. Any feeling on how the x38 boards will fair with the 9800gx2 cards? I know you can't run 2 cards (quad setup), but if I trade in my 8800gtx for a 9800gx2, I want the better performance.